Question

Sodium has 1 valence electron, which it shares with fluorine to form a covalent bond.
a. True
b. False

Answer 1

This is false because sodium gives fluorine its electron, and this is an ionic bond. Covalent bonds only form between two nonmetals

Answer 2

Answer: False

Explanation:

Ionic bonds are formed by transfer of electrons between metal and non metals.

Covalent bonds are formed by sharing of electrons between non metals.

Sodium atom has oxidation number of +1.

Electronic configuration of sodium:

$[Na]=1s^22s^22p^63s^1$

Sodium atom will loose one valence electron to gain noble gas configuration and form sodium cation with +1 charge.

$[Na^+]=1s^22s^22p^63s^0$

Florine atom has oxidation number of -1.

Electronic configuration of fluorine:

$[F]=1s^22s^22p^5$

Florine  atom will gain one electron to gain noble gas configuration and form fluoride ion with -1 charge.

$[F^-]=1s^22s^22p^6$

In sodium fluoride the one electron from sodium metal gets transferred to fluorine atom and thus form ionic bond.